Merge pull request #3543 from DavidLin1577/patch-5

[examples/network]Update tcpsendpacket.c

examples/network/tcpsendpacket.c

@@ -1,7 +1,7 @@
 #include <rtthread.h>
 
-#include <netdb.h>   /* 为了解析主机名，需要包含netdb.h头文件 */
-#include <sys/socket.h> /* 使用BSD socket，需要包含socket.h头文件 */
+#include <netdb.h>   /* 涓轰簡瑙ｆ瀽涓绘満鍚嶏紝闇€瑕佸寘鍚玭etdb.h澶存枃浠� */
+#include <sys/socket.h> /* 浣跨敤BSD socket锛岄渶瑕佸寘鍚玸ocket.h澶存枃浠� */
 
 void tcp_senddata(const char *url, int port, int length)
 {
@@ -10,45 +10,52 @@ void tcp_senddata(const char *url, int port, int length)
     struct sockaddr_in server_addr;
     rt_uint8_t *buffer_ptr;
 
-    /* 通过函数入口参数url获得host地址（如果是域名，会做域名解析） */
+    /* 閫氳繃鍑芥暟鍏ュ彛鍙傛暟url鑾峰緱host鍦板潃锛堝�鏋滄槸鍩熷悕锛屼細鍋氬煙鍚嶈В鏋愶級 */
     host = gethostbyname(url);
-    /* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
+    /* 鍒涘缓涓€涓猻ocket锛岀被鍨嬫槸SOCKET_STREAM锛孴CP绫诲瀷 */
     if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
     {
-        /* 创建socket失败 */
+        /* 鍒涘缓socket澶辫触 */
         rt_kprintf("Socket error\n");
         return;
     }
 
-    /* 申请内存 */
+    /* 鐢宠�鍐呭瓨 */
     buffer_ptr = rt_malloc(length);
-    /* 构造发送数据 */
+    if(RT_NULL == buffer_ptr)
+    {
+        /* 鐢宠�鍐呭瓨澶辫触 */
+        rt_kprintf("No memory\n");
+        return;        
+    }
+    
+    /* 鏋勯€犲彂閫佹暟鎹� */
     for (index = 0; index < length; index ++)
         buffer_ptr[index] = index & 0xff;
 
     timeout = 100;
-    /* 设置发送超时时间100ms */
+    /* 璁剧疆鍙戦€佽秴鏃舵椂闂�100ms */
     setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
-    /* 初始化预连接的服务端地址 */
+    /* 鍒濆�鍖栭�杩炴帴鐨勬湇鍔＄�鍦板潃 */
     server_addr.sin_family = AF_INET;
     server_addr.sin_port = htons(port);
     server_addr.sin_addr = *((struct in_addr *)host->h_addr);
     rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));
 
-    /* 连接到服务端 */
+    /* 杩炴帴鍒版湇鍔＄� */
     err = connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
     rt_kprintf("TCP thread connect error code: %d\n", err);
 
     while (1)
     {
-        /* 发送数据到sock连接 */
+        /* 鍙戦€佹暟鎹�埌sock杩炴帴 */
         result = send(sock, buffer_ptr, length, MSG_DONTWAIT);
-        if (result < 0) //数据发送错误处理
+        if (result < 0) //鏁版嵁鍙戦€侀敊璇��鐞�
         {
             rt_kprintf("TCP thread send error: %d\n", result);
             closesocket(sock);
 
-            /* 关闭连接，重新创建连接 */
+            /* 鍏抽棴杩炴帴锛岄噸鏂板垱寤鸿繛鎺� */
             rt_thread_delay(10);
 
             if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
@@ -59,7 +66,7 @@ void tcp_senddata(const char *url, int port, int length)
         }
         else if (result == 0)
         {
-            /* 打印send函数返回值为0的警告信息 */
+            /* 鎵撳嵃send鍑芥暟杩斿洖鍊间负0鐨勮�鍛婁俊鎭� */
             rt_kprintf("\n Send warning,send function return 0.\r\n");
         }
     }
@@ -67,7 +74,7 @@ void tcp_senddata(const char *url, int port, int length)
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
-/* 输出tcpclient函数到finsh shell中 */
+/* 杈撳嚭tcpclient鍑芥暟鍒癴insh shell涓� */
 FINSH_FUNCTION_EXPORT(tcp_senddata, send a packet through tcp connection);
 #endif